Joel Wiener’s Pinnacle Group plans to convert a six-story Crown Heights rental building just east of Prospect Park into condominium units, according to a condo offering plan filed with the New York state Attorney General’s office.

The 85-unit rent-regulated building at 12 Crown Street spans 95,500 square feet and includes one commercial unit. As of June, all 84 residential units in the building were rent-stabilized, according to the landlord’s tax records.

The conversion has a projected sellout of $74.8 million, which means an average of less than $1 million per apartment. No conversion plans have been filed yet with the Department of Buildings.